So what is this part number and how does it work with part replacement. I own a 2007 Yaris sedan and I'm looking to replace the upstream O2 sensor. I got one off AliExpress which I promptly contacted the seller for compatibility. He asked that I check if the part number corresponds.

Does this mean, even for the same model car, the parts could be different based on the number of a particular part. I don't get it. If I bought a part meant for the Yaris, is it not universal?

Hi Spellino, On the website that you bought the O2 sensor on, it probably had a list of the Toyota original equipment part numbers that it corresponded to. ( O2 sensors are usually 10 digits, starting with 89465-XXXXX or 89467-XXXXX . So you will need to find out what the Toyota part number would be for your vehicle. Then check the list. ( Different countries have different emission standards and their are also various engines and trans for different countries. So one switch will not fit all 07 Yaris. Good luck

Hi Spellino, On the website that you bought the O2 sensor on, it probably had a list of the Toyota original equipment part numbers that it corresponded to. ( O2 sensors are usually 10 digits, starting with 89465-XXXXX or 89467-XXXXX . So you will need to find out what the Toyota part number would be for your vehicle. Then check the list. ( Different countries have different emission standards and their are also various engines and trans for different countries. So one switch will not fit all 07 Yaris. Good luck